RU2739843C1 - User terminal and method of radio communication - Google Patents

Abstract

FIELD: mobile communication systems.

SUBSTANCE: invention can be used for beam reconstruction. Terminal comprises transmission section configured to transmit beam recovery request signal, and a control section configured to control transmission of said beam recovery request signal based on the received power, measured using channel state information reference signal (CSI-RS) or synchronization signal unit (SS) resource, which are connected on base of quasi-collation (QCL) with reference signal of downlink control signal demodulation.

EFFECT: technical result is improvement of system performance.

6 cl, 13 dwg

Description

The technical field to which the invention relates

The present invention relates to a user terminal and a radio communication method in next generation mobile communication systems.

State of the art

Long Term Evolution (LTE) specifications have been developed in the Universal Mobile Telecommunications System (UMTS) network in order to further increase data rates, ensure low latency, etc. (see non-patent document 1). In addition, LTE-A specifications (also called "LTE Enhanced Scheme", "LTE Release 10", "LTE Release 11", or "LTE Release 12") have been developed to further increase bandwidth and speed beyond what is possible in LTE (also called " LTE version 8 "or" LTE version 9 "), further LTE systems (also called, for example," Future Radio Access (FRA) "," 5G (5th generation mobile communication system) ", "New radio (NR, from English. New Radio)", "New radio access (NX, from English. New radio access)", "Radio access of the future generation (FX, from English. Future generation radio access)", "LTE version 14 "," LTE version 15 "and / or subsequent versions).

LTE 10/11 introduces Carrier Aggregation (CA) to combine multiple Component Carriers (CC) to achieve increased bandwidth. Each CC is formed using the bandwidth of the LTE version 8 system as one block. In addition, in a CA, a plurality of CCs belonging to the same radio base station (also called “eNB (eNodeB)”) are configured in a user terminal (also called “User Equipment (UE)”).

Meanwhile, LTE version 12 also introduces a dual connection (DC), in which several groups of cells (CG) are configured in the UE, formed by different base stations. Each cell group consists of at least one cell (or CC). Given that multiple CCs of different radio base stations are combined into a DC, the DC is also referred to as an inter-base station CA (inter-eNB CA) and / or the like.

In existing LTE systems (for example, LTE versions 8 to 13), the user terminal receives downlink control information (DCI) via a downlink (DL) control channel (for example, a physical downlink control channel ( PDCCH, from the English Physical Downlink Control CHannel), an improved physical downlink control channel (EPDCCH, from the English Enhanced Physical Downlink Control CHannel), MPDCCH (physical downlink control channel of machine-type communication (MTC, from the English Machine-type communication)) etc.). Based on this DCI, the user terminal receives downlink data channels (for example, Physical Downlink Shared Channel (PDSCH)) and / or transmits uplink data channels (for example, Physical Uplink Shared Channel (PUSCH). Uplink Shared CHannel)).

List of cited literature

Non-patent documents

Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); General description; Stage 2 (issue 8) ", April 2010

Disclosure of the essence of the invention

Technical problem

диапазонов частот (например, от 3 до 40 ГГц, и т.д.), чем существующие диапазоны частот, с целью достижения высоких скоростей и большой пропускной способности (например, как в улучшенном мобильном широкополосном доступе (еМВВ, от англ. enhanced mobile broad band)). В целом, использование увеличенных диапазонов частот подвержено большему затуханию в зависимости от расстояния, и это усложняет обеспечение требуемой зоны покрытия. Поэтому изучается технология MIMO (также называемая «multiple input multiple output, многоканальный вход/многоканальный выход», «Massive MIMO» и т.д.), в которой используется большое количество антенных элементов.Future radio communication systems under development (e.g. 5G, NR, etc.) are expected to use

frequency bands (e.g. 3 to 40 GHz, etc.) than existing frequency bands in order to achieve higher speeds and higher bandwidth (e.g., as in enhanced mobile broadband (eMBB) band)). In general, the use of increased frequency bands is prone to greater attenuation depending on distance, and this makes it difficult to provide the required coverage. Therefore, MIMO technology (also called "multiple input multiple output", "Massive MIMO", etc.), which uses a large number of antenna elements, is being studied.

In MIMO technology, which uses a large number of antenna elements, it is possible to shape beams (antenna pattern) by controlling the amplitude and / or phase of signals transmitted or received by each antenna element (which is called beamforming or beamforming (BF)). . beamforming)). For example, when the antenna elements are arranged in two dimensions, the higher the frequency, the greater the number of antenna elements that can be placed in a certain area (number of antenna elements). As the number of antenna elements in a given area increases, the beamwidth becomes narrower (narrower) and the directivity increases. Therefore, by using beamforming technology, propagation loss (path loss) can be reduced and the required coverage can be achieved even in high frequency bands.

At the same time, when beamforming technology is used (for example, when narrower beams in higher frequency bands are likely to be used), the quality of the beams (also called, for example, Beam Pair Link (BPL)) can deteriorate due to shading caused by obstacles and / or similar factors, and as a result, radio link failures (RLF, from English. Radio Link Failure) can often occur. Cellular connections must be re-established when RLFs occur, so if RLFs occur frequently it can degrade system performance.

Therefore, in order to prevent the occurrence of RLF, when the quality of a particular beam deteriorates, it is preferable to adequately switch to another beam (this is called "beam recovery", "L1 / L2 beam recovery" and / or the like). In this case, the problem is based on what conditions a Beam Failure should be detected and / or a beam recovery should be triggered.

The present invention has been developed in view of the above, and therefore, an object of the present invention is to provide a user terminal and a radio communication method according to which beam recovery can be properly triggered.

Solution to the problem

According to one aspect of the present invention, a user terminal comprises a transmission section configured to transmit a signal for requesting switching of an active beam used for downlink transmission and a control section configured to control transmission of said request signal based on a first received power measured using a channel status information reference signal (CSI-RS) resource that is associated with an active beam and a predetermined threshold value, wherein the control section is configured to control transmission of said request signal based on the first received power and the second received power measured using the CSI resource -RS associated with an inactive beam.

According to another aspect of the present invention, a user terminal comprises a transmission section configured to transmit a signal for requesting switching of an active beam used for downlink transmission and a control section configured to control transmission of said request signal based on a first received power measured using resource of the channel status information reference signal (CSI-RS), which is associated with the active beam, and a predetermined threshold value, and the control section is configured to control the transmission of the specified request signal based on the third received power measured using the synchronization signal block (SS, from the English synchronization signal) of the active beam, and the fourth received power, measured using the SS block of the inactive beam.

Beneficial effects of the invention

According to the present invention, beam recovery can be properly triggered.

Brief Description of Drawings

FIG. 1A and 1B are conceptual diagrams showing examples of beam steering.

FIG. 2A and 2B are diagrams showing examples of CSI-RS resource configurations.

FIG. 3 is a diagram showing an example of beam measurement according to an embodiment of the present invention.

FIG. 4 is a diagram showing another example of beam measurement according to an embodiment of the present invention.

FIG. 5 is a block diagram illustrating examples of first trigger conditions according to an embodiment of the present invention.

FIG. 6 is a block diagram illustrating examples of second trigger conditions according to an embodiment of the present invention.

FIG. 7 is a diagram showing an example of a recovery operation according to an embodiment of the present invention.

FIG. 8 is a diagram showing an exemplary structure of a radio communication system according to an embodiment of the present invention.

FIG. 9 is a diagram showing an exemplary generalized structure of a radio base station according to an embodiment of the present invention.

FIG. 10 is a diagram showing an exemplary functional structure of a radio base station according to an embodiment of the present invention.

FIG. 11 is a diagram showing an exemplary generalized structure of a user terminal according to an embodiment of the present invention.

FIG. 12 is a diagram showing an exemplary functional structure of a user terminal according to an embodiment of the present invention.

FIG. 13 is a diagram showing an exemplary hardware structure of a radio base station and user terminal according to an embodiment of the present invention.

Implementation of the invention

Future radio communication systems (e.g. 5G, NR, LTE version 14 and / or later, etc.) assume use cases characterized by, for example, high speed and high throughput (e.g. eMBB), a very large number of terminals (e.g. , massive MTS (English Machine-Type Communication), ultra-high reliability and low latency (for example, ultra-reliable communication with low latency (URLLC, from English. Ultra Reliable and Low-Latency Communications)), etc. Considering these use cases, studies are under way, for example, to implement communications using beamforming (BF) technology in future radiocommunication systems.

Beamforming (BF) includes digital BF and analog BF. Digital BF refers to the way in which signal processing is performed before encoding on the baseband (for digital signals). In this case, the Fast Inverse Fourier Transform (FFT) / Digital to Analog Conversion (DAC) / RF needs to be performed in parallel processes, as many times as there are antenna ports (RF channels). Meanwhile, it is possible to generate the number of beams in accordance with the number of RF channels at any random times.

Analog BF refers to the way RF phase shifters are used. In this case, since only the phase of the RF signals needs to be rotated, the analog BF can be implemented using simple and inexpensive configurations, but it is still not possible to generate multiple beams at the same time. Specifically, when using an analog BF, each phase-shifter can only form one beam at a time.

Thus, if the radio base station (called, for example, "gNB (node gNodeB)", "Transmission and Reception Point (TRP)", "Transmission and Reception Point x (TRxP) and Reception х Point) "," eNB (node eNode B) "," base station (BS, from the English Base Station) ", etc.) has only one phase shifter, the radio base station can form only one beam at a time time. Therefore, when transmitting multiple beams using only the analog BF, these beams cannot be transmitted simultaneously using the same resource, and the beams must be switched, rotated, etc., in time.

It should be noted that it is also possible to adopt a hybrid BF model that combines digital BF and analog BF. While research is underway for future radiocommunication systems to implement MIMO technology (eg massive MIMO), which uses a large number of antenna elements, trying to form a huge number of beams using only digital BF may result in an increase in circuit design cost. For this reason, there is a likelihood that hybrid BF will be used in future radio communication systems.

When using BF technology (including digital BF, analog BF, hybrid BF, etc.) as discussed above, the quality of the beams (also called, for example, Beam Pair Link (BPL)) may be degraded due to shadowing caused by obstructions and / or similar factors, and as a result, radio link failures (RLF) can often occur. Cellular connections must be re-established when RLFs occur, so if RLFs occur frequently it can degrade system performance. Therefore, there is a plan to implement beam steering to ensure sustainability of the BPL.

FIG. 1 is a diagram showing examples of beam steering. FIG. 1A shows beam steering for use in radio resource management (RRM) signals (mobility signal), Layer 3 (L3) measurements, received power measurements of a Layer 3 reference signal (L3-RSRP, from the English Layer 3-Reference Signal Received Power) (also called "L3 mobility measurements"), etc. The beams used for mobility measurement signals can be wide beams having relatively large beam widths. Also, since one or more beams having relatively small beam widths (also called "thinner beams", "narrower beams", and / or the like) may be located within a wide beam, a wide beam may be referred to as a "beam group. ".

In this case, the mobility measurement signals can also be called “synchronization signal blocks (SS)”, “mobility reference signals (MRS)”, “channel state information reference signals (CSI-RS , from the English Channel State Information Reference Signals) ”,“ beam-specific signals ”,“ cell-specific signals ”, etc. A SS block is a group of signals that includes at least one of the following: a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel (for example, a physical broadcast channel (Strategic Missile Forces, from the English Physical Broadcast CHannel)). Thus, the mobility measurement signal may be at least one of PSS, SSS, PBCH, MRS, and CSI-RS, or may be a signal generated by amplifying and / or changing at least one of PSS, SSS, PBCH, MRS and CSI-RS (eg, a signal generated by changing the density and / or cycle of at least one of these signals).

It should be noted that, with reference to FIG. 1A, the user terminal may be in either an RRC connected mode or an idle mode, but the user terminal only needs to be in a mode in which it can identify mobility measurement signal patterns. Also, the user terminal does not need to generate Rx beams (receive beams).

FIG. 1A, a radio base station (also called "TRP") transmits mobility measurement signals (eg, SS blocks and / or CSI-RS signals) associated with beams B1-B3. FIG. 1 uses an analog BF so that the mobility measurement signals associated with beams B1 to B3 are transmitted at different times (eg, on different symbols, slots, etc.) (this is also called "beam sweep"). With digital BF, the MRS signals associated with beams B1 to B3 can be transmitted at the same time.

A user terminal (UE) performs L3 measurements using mobility measurement signals associated with beams B1 to B3. It should be noted that in L3 measurements, the received power (for example, at least one of RSRP and RSSI (from the English Reference Signal Strength Indicator)) and / or the received quality (for example, at least one from RSRQ (Reference Signal Received Quality, the received quality of the reference signal), SNR (from the English Signal-Noise Ratio, signal-to-noise ratio) and SINR (from the English Signal-to-lnterference plus Noise Power Ratio, signal ratio - interference plus noise)) mobility measurement signals.

Also, the user terminal can select (group of) beams (groups of beams) based on the L3 measurements. For example, in FIG. 1, the user terminal can classify beam B2 as an active beam and beams B1 and B3 as inactive beams (spare beams). In this case, an active beam can be called a beam that can be used for the downlink control channel (hereinafter also called "NR-PDCCH") and / or downlink data channel (hereinafter also called "PDSCH"), and an inactive beam can be called a beam (potential beam ), which is not an active ray. A set of one or more active beams may be referred to as an “active beam set,” etc., and a set of one or more inactive beams may be referred to as an “inactive beam set,” and so on.

The user terminal transmits a measurement report (MR) that contains the identifiers of one or more beams (also called "beam IDs", "beam indices (BI)", etc.) and / or measurements of these beams using higher layer signaling (eg, RRC signaling). It should be noted that instead of beam IDs, mobility measurement signal resources, antenna ports, etc. may be reported. For example, in FIG. 1A, the user terminal transmits a measurement report including the BI and / or RSRP of beam B2 with the best RSRP.

FIG. 1B shows L1 (physical layer) beam control elements (also called beam measurements, L1 (layer 1) measurements, CSI (Channel State Information) measurements, L1-RSRP measurements " etc.). The signals subject to beam measurements (beam measurement signal) may include at least one of the following: CSI-RS, SS block, PSS, SSS, RVSN, and MRS, or signals generated by amplification and / or change in at least one of these signals (eg, signals generated by changing the density and / or cycle of at least one of these signals).

For example, in L1 beam steering, beams (also called "Tx beams", "transmit beams", and / or the like) to be used for transmitting NR-PDCCH and / or PDSCH (hereinafter also called "NR-PDCCH / PDSCH "), and / or beams (also called" Rx beams "," receive beams "and / or the like) to be used to receive these NR-PDCCH / PDSCH.

FIG. 1B shows that the radio base station (TRP) transmits configuration information related to the K (here K = 4) CSI-RS resources # 1 to # 4 that are associated with the K Tx beams B21 to B24 to the user terminal.

A CSI-RS resource may refer, for example, to at least one of the following: a CSI-RS NZP resource (Non-Zero-Power) and a CSI-RS ZP resource (Zero-Power) ) to measure interference (IM, from the English. Interference Measurements). The user terminal measures the CSI for each CSI process in which one or more CSI-RS resources are configured. The CSI-RS resource may be replaced by the CSI-RS (including NZP-CSI-RS and / or ZP-CSI-RS) that is transmitted using this CSI-RS resource.

The user terminal (UE) measures the configured CSI-RS resources # 0 - # 3. More specifically, the user terminal performs L1 measurements (e.g., CSI measurements and / or L1-RSRP measurements) for K CSI-RS resources, which are respectively associated with K (here K = 4) Tx beams B21 - B24, and generates CSI and / or L1-RSRP based on measurement results.

Here, the CSI may include at least one of the following: Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank indicator (RI). Rank Indicator) and CSI-RS Resource Indicator (CRI, from the English CSI-RS Resource Indicator). As previously mentioned, Tx beams are associated with CSI-RS resources, so the CRI can be said to define a Tx beam.

Based on the measurements of the K Tx beams (or the corresponding K CSI-RS resources), the user terminal selects N (K≤N) Tx beams. Here, the number of Tx beams or "N" may be predetermined, configured with higher layer signaling, or specified with physical layer signaling.

The user terminal can determine which Rx beam is appropriate for each selected Tx beam and select Paired Beam Links (BPLs). Here, BPL means the optimal combination of Tx beam and Rx beam. For example, in FIG. 1B, the combination of Tx beam B23 and Rx of beam b3 is selected as the best BPL, and the combination of Tx beam B22 and Rx of beam b2 is selected as the second best BPL.

The user terminal transmits N CRIs to the radio base station, corresponding to the N Tx selected beams, and at least one of the following: CQI, RI, and PMI for the N Tx beams, as indicated by the N CRI. Also, the user terminal can transmit RSRP for N Tx beams to the radio base station. Also, the user terminal may transmit Rx beam identifiers (also called "Rx beam IDs", "BI", "beam IDs" and / or the like) corresponding to the N Tx beams.

The radio base station selects a Tx beam (or BPL) for use with the NR-PDCCH and / or PDSCH (NR-PDCCH / PDSCH) and indicates this Tx beam (or BPL) to the user terminal. More specifically, the radio base station may select a Tx beam for use with the NR-PDCCH and / or PDSCH (NR-PDCCH / PDSCH) based on the N CSI from the user terminal (e.g., N CRI, at least one of CQI, RI and PMI for Tx beams as indicated by these N CRIs, etc.) and / or L1-RSRP from the user terminal. Also, the radio base station can select the BPL based on the Rx beam ID corresponding to this Tx beam.

The beams can be indicated by the radio base station to the user terminal based on links (quasi-location (QCL)) between the antenna ports (DMRS ports) of the NR-PDCCH / PDSCH demodulation signals (DMRS) and the CSI-RS resources. It should be noted that the QCL between DMRS ports and CSI-RS resources can be specified separately for NR-PDCCH and PDSCH.

For example, in FIG. 1C information showing the relationship between the best BPL CSI-RS resource # 2 (Tx beam B23 and Rx beam b3) in FIG. 1B and DMRS port # 0, and the communication between CSI-RS resource # 1 of the second best BPL (Tx beam B22 and Rx beam b2) and DMRS port # 1 is reported from the radio base station to the user terminal through higher layer signaling and / or signaling physical layer (for example, DCI).

FIG. The 1C user terminal demodulates the NR-PDCCH / PDSCH on the basis that, at DMRS port # 0, this NR-PDCCH is transmitted using Tx beam B23, thereby obtaining the best CSI-RS resource measurement # 2. In addition, the user terminal can demodulate the NR-PDCCH / PDSCH with an Rx beam b3 that corresponds to this Tx beam B23.

The user terminal demodulates the NR-PDCCH / PDSCH based on the fact that, at DMRS port # 1, the NR-PDCCH is transmitted using Tx beam B22, thereby obtaining the best CSI-RS resource # 1 measurement. In addition, the user terminal can demodulate the NR-PDCCH / PDSCH with an Rx beam b2 that corresponds to this Tx beam B22.

In the beam steering discussed above, the problems that can arise from degradation of specific beams relate to the conditions under which a Beam Failure (BF) is to be detected and / or beam recovery is to be triggered.

Currently, in future radio communication systems (e.g., NR, 5G, LTE version 14 and / or later, etc.), it is assumed that CSI-RS resources are shared between L1-RSRP measurements and L3-RSRP measurements, or individual CSI-RS resources will be configured.

FIG. 2 are diagrams showing examples of CSI-RS resource configurations. FIG. 2A shows examples of CSI-RS resource configurations shared between L1-RSRP measurements and L3-RSRP measurements. For example, in FIG. 2A, the user terminal performs L1-RSRP measurements and L3-RSRP measurements using CSI-RS resources # 0 through # 3 associated with Tx beams B21 through B24, respectively. It should be noted that in FIG. 2A, the same RSRP that is measured based on each CSI-RS resource can be used as L1-RSRP and / or as L3-RSRP.

FIG. 2B shows examples of individual configurations of CSI-RS resources for L1-RSRP measurements (hereinafter also referred to as "CSI-RS (L1) resources") and CSI-RS resources for L3-RSRP measurements (also referred to as "CSI-RS (L3) resources" ).

For example, in FIG. 2B, the user terminal performs L1-RSRP measurements using CSI-RS (L1) resources # 0 through # 3, which are associated with Tx beams B21 through B24, respectively. Also, the user terminal performs L3-RSRP measurements using CSI-RS (L3) resources # 0 through # 3, which are associated with Tx beams B11, B14, B23, and B32, respectively. It should be noted that although not shown in the drawings, CSI-RS (L3) resources can be associated with wide beams (eg, Tx beams B1-B3).

While using L1-RSRP for beam steering (eg beam steering for NR-PDCCH / PDSCH), L3-RSRP is most promising for mobility management. Therefore, as shown in FIG. 2B, CSI-RS (L1) resources # 0 to # 3 are associated with a predetermined number of Tx beams (here B21 to B24) in a relatively narrow range. On the other hand, CSI-RS (L3) resources # 0 - # 3 are associated with a given number of Tx beams (here B11, B14, B23 and B32), which are represented in a wider range than CSI-RS (L1) resources # 0 - # 3.

It should be noted that in FIG. 2B CSI-RS (L1) resource and CSI-RS (L3) resource are associated with beams with the same beamwidth (thinner beams), and CSI-RS (L3) resources can be associated with beams having larger beamwidths (wider beams, eg, beams B1-B3 of FIG. 2B) than the resource beams CSI-RS (L1). By associating CSI-RS (L3) resources with a wide beam, it is possible to cover a wider range.

Thus, in future radio communication systems, CSI-RS (CSI-RS resources) are used to measure at least one of CSI, L1-RSRP, and L3-RSRP. However, as the number of beams in which CSI-RS resources are configured increases, there is a possibility that the measurement load on the user terminal will increase. For this reason, when considering future radio communication systems, studies are under way to limit the number of beams for configuring CSI-RS resources and making L1-RSRP measurements and / or L3-RSRP measurements using SS blocks.

Thus, in future radio systems (e.g., NR, 5G, LTE version 14 and / or later, etc.), it is expected to measure the received power (e.g., L1-RSRP and / or L3-RSRP) of one or more beams using several different measurement signals (eg CSI-RS signals and / or SS blocks). The problem in this case has to do with what conditions should be applied to determine when ray recovery should be triggered.

Thus, the present inventors have developed a method for detecting a beam failure and / or triggering beam recovery properly when the received power (e.g., L1-RSRP and / or L3-RSRP) of one or more beams is measured using various measurement signals (e.g. CSI-RS and / or SS blocks), and came to the creation of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. It should be noted that although beamforming in accordance with the embodiments of the present invention disclosed herein assumes a digital BF, analog BF and hybrid BF can be used as needed.

Also, "beams" according to embodiments of the present invention disclosed herein may include beams used to transmit downlink signals from radio base stations (also called "transmit beams", "Tx beams", etc.) and / or beams used to receive downlink signals at user terminals (also called "receive beams", "Rx beams", etc.). Combinations of Tx beams and Rx beams may be referred to as "Paired Beam Links" (BPL) and / or the like.

(Beam measurements)

Next, examples of beam measurements in accordance with an embodiment of the present invention will be shown with reference to FIGS. 3 and FIG. 4.

FIG. 3 is a diagram showing an example of beam measurement according to an embodiment of the present invention. For example, in FIG. 3 CSI-RS resources # 0 to # 3 are configured in Tx beams B21 to B24 in beam B2 (active beam), respectively. At the same time, Tx beams B11-B14 and B31-B34 in beams B1 and B3 (inactive beams, spare beams, etc.) have no CSI-RS resources configured.

FIG. 3 L1-RSRP and / or L3-RSRP Tx beams B21 through B24 are measured using CSI-RS resources # 0 through # 3, respectively. At the same time, L1-RSRP and / or L3-RSRP of beams B1 and B3 are measured using the respective SS blocks. It should be noted that in FIG. 3 L1-RSRP and / or L3-RSRP of beam B2 can be measured using SS blocks.

FIG. 4 is a diagram showing another example of beam measurement according to an embodiment of the present invention. For example, in FIG. 4 CSI-RS resources # 0 to # 7 are configured in Tx beams B21 to B24 in beam B2 and Tx beams B31 to B34 in beam B3, respectively. In this case, let us assume that the Tx rays B21 - B24 are activated, and the Tx rays B31 - B34 are deactivated. At the same time, CSI-RS resources are not configured in Tx beams B11 to B14 of beam B1. Alternatively, CSI-RS resources # 0 through # 3 are configured for L1-RSRP measurement for beam steering, and CSI-RS resources # 0 through # 7 are configured for L3-RSRP measurement for mobility management.

FIG. 4 L1-RSRP and / or L3-RSRP Tx beams B21 through B24 are measured using CSI-RS resources # 0 through # 3, respectively. Also, L1-RSRP and / or L3-RSRP Tx beams B31 through B34 are measured using CSI-RS resources # 4 through # 7, respectively. At the same time, the L1-RSRP and / or L3-RSRP of the B1 beam are measured using the corresponding SS blocks.

It should be noted that in FIG. The 4 L1-RSRP and / or L3-RSRP of beams B2 and / or B3 can be measured using SS blocks. Also, although the CSI-RS resources in FIG. 3 and FIG. 4 are associated with narrow beams, CSI-RS resources can be associated with wide beams (eg, beams B1-B3) and L1-RSRP of wide beams, and / or L3-RSRP can be measured using CSI-RS resources.

Also in FIG. 3 and FIG. 4 L1-RSRP and / or L3-RSRP are measured using the configured CSI-RS resources, it is equally possible to measure CSI using these CSI-RS resources.

(Launch conditions)

Next, referring to FIG. 3 to FIG. 6, trigger conditions for transmitting a beam recovery request signal (beam recovery signal) in accordance with an embodiment of the present invention will be disclosed. Provided that a beam recovery signal is transmitted when a beam failure event occurs, the triggering conditions may be referred to as “beam failure event conditions”. Also, the beam recovery signal can serve as a signal to convey a beam failure message.

<First start conditions>

The first trigger conditions assume that L CSI-RS resources are configured for L3-RSRP measurement and N CSI-RS resources are configured for L1-RSRP measurement. For example, consider the case in which, as shown in FIG. 4, CSI-RS resources # 0 - # 3 associated with N Tx beams B21 - B24 (active beams) are configured for L1-RSRP measurements, and CSI-RS resources # 4 - # 7 associated with L Tx beams B21 - B24 (inactive beams), configured for L3-RSRP measurements.

FIG. 5 is a block diagram illustrating examples of first trigger conditions according to an embodiment of the present invention. As shown in FIG. 5, in step S101, the user terminal compares the L1-RSRP values (also called “L1-CSI-RSRP” and / or the like) that have been measured based on the CSI-RS resources of a predetermined number of active beams with a predetermined threshold value.

The predetermined number of active beams may here be equal to N Tx beams (eg, Tx beams B21 - B24 in FIG. 4) associated with N CSI-RS resources configured for L1-RSRP measurements. Alternatively, the above predetermined number of active beams may be equal to M (M N) Tx beams, the measurement results of which are reported to the radio base station, among N Tx beams.

For example, in step S101, the user terminal may determine whether the L1-CSI-RSRP values for a given number of active beams are below a given threshold value. The user terminal can also determine whether the L1-CSI-RSRP value of the lowest quality active beam is below a predetermined threshold or not. Alternatively, the user terminal may determine whether the L1-CSI-RSRP value of the highest quality active beam is above a predetermined threshold or not.

If the L1-CSI-RSRP values for the given number of active beams (or the L1-CSI-RSRP value of the worst-quality or best-quality active beam) is below a predetermined threshold, then the user terminal may proceed to step S102. Alternatively, the user terminal may proceed to step S102 when the state corresponding to the above condition continues for a predetermined period of time or longer.

In step S102, the user terminal compares the aforementioned L1-CSI-RSRP values measured based on CSI-RS of active beam resources and L3-RSRP values (also called “L3-CSI-RSRP values”, etc.) that have been measured based on CSI-RS resources of inactive beams.

For example, in step S102, the user terminal may determine whether or not the L1-CSI-RSRP value of the active beam in use (e.g., at least one of Tx beams B21 and B22 in FIG. 4) is lower than the L3-CSI-RSRP value of the inactive beam ( for example, at least one of the Tx beams B31 - B32 of Fig. 4). Alternatively, the user terminal may determine whether or not the value set by adding a predetermined deviation to L1-CSI-RSRP, the L3-CSI-RSRP value.

If the L1-CSI-RSRP value of the active beam (or the value specified by adding a given deviation to the L1-CSI-RSRP value, where the deviation can be positive or negative) is less than the L3-CSI-RSRP value of the inactive beam, then the user terminal can go to step S103. Alternatively, the user terminal may proceed to step S103 when the state corresponding to the above condition continues for a predetermined period of time or longer.

When the conditions of both S101 and S102 are met, a beam failure event occurs, and in S103, the user terminal transmits a beam recovery signal. It should be noted that in FIG. 5, the order of steps S101 and S102 may be reversed, or steps S101 and S102 may be performed at the same time.

In accordance with the first trigger conditions, the transmission of a beam recovery signal is initiated (a beam failure event occurs) based on the L1-CSI-RSRP values of the active beams and the L3-CSI-RSRP values of the inactive beams (for example, Tx beams B31-B33 of FIG. 4) so that when CSI-RS resources are configured in inactive beams, the user terminal can correctly recognize the presence of potential Tx beams to switch to them and perform beam reconstruction properly.

Also, although no CSI-RS resource is associated with L wide beams (eg, beams B1-B3) in FIG. 4, it is still possible to associate L wide beams with CSI-RS resources. For example, in FIG. 4 CSI-RS resources # 0 - # 3 associated with N Tx beams B21 - B24 (active beams) are configured for L1-RSRP measurements, and CSI-RS resources # 4 - # 6 associated with L wide beams (e.g. beams B1 - B3) configured for L3-RSRP measurements.

In this case, in step S102, the L1-CSI-RSRP values of the active beams and the L3-CSI-RSRP values of the wide beams change with respect to the beam range, measurement accuracy, etc., and, in some cases, do not need to be compared in their original form. ... With such cases in mind, in step S102, instead of the L1-CSI-RSRP values of active beams, the L3-CSI-RSRP value measured based on the CSI-RS resource associated with CSI-RS resources # 0 to # 3 (e.g., CSI- RS # 5) can be compared with the L3-CSI-RSRP value of inactive beams.

Herein, CSI-RS resources # 0 - # 3 for beam steering and / or measurements CSI and CSI-RS resources for mobility management can be associated with each other based on QCL (quasi-location) using commands sent from the base station to the UE. More specifically, information representing these links is signaled through higher layer signaling when configuring CSI-RS resources # 0 to # 3 for beam steering and / or CSI measurements.

<Second trigger conditions>

The second trigger condition assumes that L CSI-RS resources are not configured for L3-RSRP measurement, and N CSI-RS resources are configured for L1-RSRP measurement.

For example, consider the case in which, as shown in FIG. 3, CSI-RS resources # 0 to # 3 associated with N Tx beams B21 to B24 (active beams) are configured for L1-RSRP measurements, but no CSI-RS resources are configured in inactive beams for L3-RSRP measurements. It should be noted that in FIG. 3, it may also be assumed that the L1-RSRP and / or L3-RSRP (also called “L1 / L3-SS-RSRP”, etc.) values are measured using the corresponding blocks SS of beams B1 to B3.

FIG. 6 is a block diagram illustrating examples of second trigger conditions according to an embodiment of the present invention. Steps S201 and S203 in FIG. 6 are similar to steps S101 and S103, respectively, in FIG. 5. It should be noted that, as in the case of FIG. 5, the order of steps S201 and S202 may be reversed, or steps S201 and S202 may be performed at the same time.

In step S202, the user terminal compares the L1 / L3-SS-RSRP values of the active beams with the L1 / L3-SS-RSRP values of the inactive beams.

In doing so, the user terminal can determine which SSs correspond to active beams based on the communication between CSI-RS resources # 0 to # 3 for beam control and / or CSI measurements and SS units for mobility management. CSI-RS resources # 0 - # 3 and SS units can be linked to each other based on QCL (quasi-locating) using commands sent from the base station to the UE. More specifically, information representing these links is signaled by higher layer signaling when configuring CSI-RS resources # 0 to # 3 for beam steering and CSI measurements.

For example, the user terminal may determine whether or not the L1 / L3-SS-RSRP of the active beam (e.g., beam B2 in FIG. 3) is below the L1 / L3-SS-RSRP value of the inactive beam (e.g., at least one of the beams B1 and B3 of Fig. 3). Alternatively, the user terminal may determine whether or not the value set by adding an offset to the L1 / L3-SS-RSRP value of the active beam, the L1 / L3-SS-RSRP value of the inactive beam.

If the L1 / L3-SS-RSRP value of the active beam (or the value set by adding a deviation to the L1 / L3-SS-RSRP value) is less than the L1 / L3-SS-RSRP value of the inactive beam, then the user terminal may go to step S203. Alternatively, the user terminal may proceed to step S203 when the state corresponding to the above condition continues for a predetermined period of time or longer.

According to the second trigger conditions, a beam recovery signal is triggered (a beam failure event occurs) based on the L1 / L3-SS-RSRP values of the active beams and the L1 / L3-SS-RSRP values of the inactive beams, so that when the CSI-RS resources configured in inactive beams, the user terminal can correctly recognize the presence of potential Tx beams in order to switch to them and perform beam recovery properly.

<Other trigger conditions>

It should be noted that the trigger conditions for transmitting the beam recovery signal are in no way limited to the above first and second trigger conditions. At least one of the L3-RSRP (L3-SS-RSRP) value measured using SS blocks, L1-RSRP (L1-SS-RSRP) value measured using SS blocks, L3-RSRP (L3-CSI- RSRP) measured using CSI-RS resources and the L1-RSRP value (L1-CSI-RSRP) measured using CSI-RS resources can be used to determine trigger conditions.

Also, the SS blocks can be transmitted in wide beams (eg, at least one of beams B1-B3 in FIG. 3 and FIG. 4). In addition, CSI-RS resources can be configured in wide beams (for example, at least one of beams B1-B3 in Fig. 3 and Fig. 4) and / or in narrow beams (for example, at least one of Tx beams B11 - B14, B21 - B24 and B31 - B34 in Fig. 3 and Fig. 4). As discussed above with reference to FIG. 2A and 2B, common CSI-RS resources may be configured for L1-CSI-RSRP measurements and L3-CSI-RSRP measurements, or separate CSI-RS resources may be configured.

Also, triggering conditions can be defined not only taking into account RSRP, but also taking into account RSRQ. Similar to RSRP, the RSRQ value can also be measured at one or more layers (eg, L1 and / or L3) using SS and / or CSI-RS resource blocks. Also, the trigger condition can be determined in consideration of the CSI K Tx beams where the CSI-RS resources are configured.

(Recovery operation)

Next, referring to FIG. 7, a beam recovery operation using the above-disclosed trigger conditions will be disclosed.

FIG. 7 is a diagram showing an example of a recovery operation according to an embodiment of the present invention. It should be noted that in FIG. 7, a case is assumed in which Tx beams # 3 are active beams and Tx beams # 1, # 2, and # 4 are inactive beams.

FIG. 7, the user terminal measures at least one of L3-RSRP, L3-RSRQ, and L1-RSRQ, in a predetermined cycle, based on mobility measurement signals (eg, SS blocks and / or CSI-RS signals). The user terminal detects the presence of a beam failure (new best beam) based on the above trigger conditions.

The user terminal transmits a beam recovery signal (eg, a PRACH preamble, a scheduling request (SR), or a vacant UL UL grant signal). The beam recovery signal can be transmitted using an uplink resource associated with the resource (or antenna port) of the mobility measurement signal. As a result, the user terminal can explicitly communicate the new best beam beam ID to the radio base station.

Also, the beam recovery signal may include at least one of beam IDs (or information related to beam IDs (e.g., CRI)), L3-RSRP, L1-RSRP, L3-RSRQ, and L1-RSRQ of a potential beam, to which switch is expected. If none of these are included, SR modulated based on BPSK (Binary Phase Shift Keying) or QPSK (Quadrature Phase Shift Keying) can be used as a recovery signal. ray.

Also, when UL is not synchronized, PRACH can be used as a beam recovery signal. In this case, the user terminal can transmit the PRACH for use as a beam recovery signal using a different resource than the one used in the initial access.

The radio base station transmits a response signal (eg, RAR) in response to the beam recovery signal from the user terminal. The response signal may include configuration information about the beamset containing the new best beam (e.g., at least one of CSI-RS resource configuration information, configuration information related to CSI message transmission and / or L1 message transmission -RSRP, and resource configuration information).

To transmit this response signal, it is necessary to transmit scheduling information (DCI) of the response signal using the NR-PDCCH (User Terminal Specific Search Area). At the same time, in FIG. 7, the NR-PDCCH cannot be used due to the beam failure that has occurred.

Thus, an NR-PDCCH (also called "common search space (SSC)" and / or the like) for use for at least one of RAR, paging, and system information blocks (SIB, system information blocks) can be used to transmit response scheduling information (DCI). In this case, the scrambling information can be scrambled (masked) using an indicator (for example, C-RNTI (Cell-Radio Network Temporary Identifier) specific to the user terminal).

Alternatively, a PDCCH shared by a group of one or more user terminals (also called "UE group search area", etc.) may be used to transmit scheduling information of the response signal. In this case, the scheduling information (also called "DCI group" and / or the like) can be scrambled (masked) using an indicator common to these user terminals.

Also, when CSI-RS transmission and CSI message transmission in inactive beams (e.g., Tx beams B31-B34 in FIG. 4) are activated by a response signal, control information for triggering this activation may be included in a MAC control element (MAC CE, from English MAC control element) and transmitted in the response signal. Alternatively, this control information may be included in the DCI, which includes the aforementioned response scheduling information.

(Radio communication system)

Next, the structure of a radio communication system according to an embodiment of the present invention will be disclosed. In this radio communication system, communication is performed using one or a combination of radio communication methods according to embodiments of the present invention to carry out the communication contained in this application.

FIG. 8 is a diagram showing an exemplary block diagram of a radio communication system according to an embodiment of the present invention. The radio communication system 1 may support carrier aggregation (CA) and / or dual connection (DC) for grouping a plurality of fundamental frequency blocks (component carriers) into one, with the bandwidth of the LTE system (eg, 20 MHz) being one unit.

It should be noted that the radio communication system 1 may be called "LTE (long-term development scheme)", "LTE-A (advanced long-term development scheme)", "LTE-B (from the English LTE-Beyond, super-LTE)", "SUPER 3G "," advanced IMT scheme "," 4G (4th generation mobile communication system) "," 5G (5th generation mobile communication system) "," FRA (future radio access) "," New-RAT (from the English Radio Access Technology, radio access technology) ", etc., or can be considered as a system that implements the above technologies.

The radio communication system 1 contains a radio base station 11, which forms a macro cell C1 with a relatively wide coverage area, and base radio stations 12 (12a - 12c), which are located in the macro cell C1 and form small cells C2, narrower than the macro cell C1. Also, the user terminal 20 is located in the macro cell C1 and each small cell C2.

The user terminal 20 can connect to both the radio base station 11 and the radio base stations 12. The user terminal 20 can simultaneously use the macro cell C1 and small cells C2 using a CA or DC. In addition, user terminals 20 may apply CA or DC using multiple cells (component carriers, CCs) (eg, five or fewer component carriers or six or more component carriers).

The user terminals 20 and the radio base station 11 communicate using a carrier with a relatively low frequency range (eg, 2 GHz) and narrow bandwidth (called, eg, “existing carrier,” “effective carrier,” etc.). At the same time, a carrier with a relatively high frequency range (e.g., 3 to 40 GHz) and wide bandwidth may be used between the user terminals 20 and the radio base stations 12, or the same carrier as used in the radio base station 11 can be used. It should be noted that the frequency band structure for use in each radio base station is in no way limited to those listed above.

Here, a structure can be applied in which a wired connection is established between the radio base station 11 and the radio base station 12 (or between two radio base stations 12) (for example, means in accordance with the public radio interface (CPRI), such as fiber, X2 interface, etc.) or wireless connection.

Each of the radio base station 11 and the radio base stations 12 is connected to the higher level station apparatus 30 and connected to the core network 40 through the higher station apparatus 30. It should be noted that the higher-level station apparatus 30 may, for example, be an access gateway apparatus, a radio network controller (RNC) and a mobility management entity (MME), but is not limited to by them. In addition, each radio base station 12 can be connected to a higher-level station apparatus 30 via the radio base station 11.

It should be noted that the radio base station 11 is a radio base station that has a relatively wide coverage area and may be called a “macro base station”, “hub site”, “eNodeB (eNB)”, “transmit / receive point”, etc. In addition, radio base stations 12 are radio base stations that have a local coverage area and may be called “small base stations”, “micro base stations”, “pico base stations”, “femto base stations”, “home eNodeBs (HeNB). Home eNodeB) ”,“ remote radio units (RRH, from the English Remote Radio Head) ”,“ transmission / reception points ”, etc. Hereinafter, radio base stations 11 and 12 will be referred to generally as “radio base stations 10” unless otherwise indicated.

User terminals 20 are terminals supporting various communication schemes such as LTE, LTE-A, etc., and may be mobile communication terminals (mobile stations) or fixed communication terminals (fixed stations).

In the radio communication system 1, as radio access schemes, orthogonal frequency division multiple access (OFDMA) is used for the downlink, and single carrier frequency division multiple access (SC-FDMA, from the English. single-carrier frequency division multiple access) and / or OFDMA are applied for the uplink.

OFDMA is a multi-carrier communication scheme for communicating by dividing a frequency band into multiple narrow frequency bands (sub-carriers) and mapping data to each sub-carrier. SC-FDMA is a single carrier communication scheme for reducing mutual interference between terminals by dividing the system bandwidth into bands formed by one or contiguous resource blocks per terminal and allowing multiple terminals to use mutually different bands. It should be noted that the uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.

In radio system 1, the downlink data channel (PDSCH (Physical Downlink Shared CHannel)) used by each user terminal 20 on a common basis, the broadcast channel (physical broadcast channel (RVSN, from the English Physical Broadcast CHannel) ), downlink L1 / L2 control channels, etc. used as downlink (DL) channels. User data, higher-level control information and system information blocks (SIBs) are transmitted over the PDSCH channel. Also, the block of basic information (MIB, from the English Master Information Block) is transmitted via the Strategic Missile Forces channel.

Downlink L1 / L2 Control Channels include Physical Downlink Control CHannel (PDCCH), Enhanced Physical Downlink Control Channel (EPDCCH), Physical Downlink Control Channel (PCFICH) , from the English Physical Control Format Indicator CHannel), the physical indicator channel of the hybrid ARQ (PHICH, from the English Physical Hybrid-ARQ Indicator CHannel), etc. Downlink control information (DCI) including PDSCH and PUSCH scheduling information is transmitted on the PDCCH. The number of OFDM symbols used for the PDCCH is transmitted on the PCFICH. Transmission acknowledgment information (also called, for example, "retransmission control information", "HARQ-ACK", "ACK / NACK", and / or the like) of Hybrid Automatic Repeat Request (HARQ) reQuest) is transmitted on the PHICH in response to the PUSCH. The EPDCCH is frequency division multiplexed with PDSCH and used to transmit DCI, etc., similar to PDCCH. PDCCH and / or EPDCCH are also called "downlink control channel", "NR-PDCCH" and the like.

In the radio communication system 1, an uplink data channel (PUSCH: physical uplink common channel) shared by each user terminal 20, an uplink control channel (PUCCH: a physical uplink control channel) and a random access channel (PRACH: physical physical random access channel, etc. User data and higher layer control information are transmitted over the PUSCH channel Also, downstream quality information (CQI), delivery confirmation information and etc. are transmitted on PUCCH Preambles are transmitted via PRACH to establish connections with cells.

In radio communication systems 1, cell-specific reference signal (CRS), channel status information reference signal (CSI-RS), demodulation reference signal (DMRS), positioning reference signal (PRS) positioning reference signal), mobility reference signal (MRS), etc. transmitted as downstream reference signals. Also, in the radio communication system 1, a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. are transmitted as upstream reference signals. It should be noted that the DMRS may be referred to as a "user terminal specific reference signal (UE specific reference signal)". Also, the reference signals to be transmitted are not limited to the above in any way. In the radio communication system 1, synchronization signals (PSS and / or SSS), a broadcast channel (PBCH), and others are transmitted in the downlink.

(Radio base station)

FIG. 9 is a diagram of an exemplary generalized structure of a radio base station according to an embodiment of the present invention. The radio base station 10 includes a plurality of transmit / receive antennas 101, amplification sections 102, transmit / receive sections 103, a baseband signal processing section 104, a call processing section 105, and a communication path interface 106. It should be noted that one or more transmit / receive antennas 101, gain sections 102, and transmit / receive sections 103 may be provided.

User data to be transmitted from the radio base station 10 to the user terminal 20 on the downlink is input from the higher level station apparatus 30 to the baseband signal processing section 104 via the communication path interface 106.

In the baseband signal processing section 104, the user data is subjected to transmission processes including the PDCP (Packet Data Convergence Protocol) layer process, user data separation and connection, RLC (Radio Link) layer transmission processes Control, radio link control) such as RLC retransmission control, MAC retransmission control (Medium Access Control) (for example, HARQ transmission process (Hybrid Automatic Repeat reQuest, Hybrid Automatic Repeat Request) ), scheduling, transfer format selection, channel coding, fast inverse Fourier transform (FFT) process and precoding process, and the result is transmitted to each transmit / receive section 103. In addition, the downlink control signals are also subjected to transmission processes such as channel coding and fast inverse Fourier transform, and are transmitted in each transmission / reception section 103.

The baseband signals, pre-encoded and output from the baseband signal processing section 104 for each antenna, are converted to the radio frequency range in the transmit / receive sections 103 and then transmitted. RF signals subjected to frequency conversion in the transmit / receive sections 103 are amplified in the amplifying sections 102 and transmitted from the transmit / receive antennas 101. The transmit / receive sections 103 may be formed by transmitters / receivers, transmit / receive circuits, or a transmit / receive device, which can be characterized based on a general understanding of the art to which the present invention pertains. It should be noted that the transmission / reception section 103 may be constructed as a single transmission / reception section, or may be constructed of a transmission section and a reception section.

At the same time, as for the uplink signals, each of the radio frequency signals received at the transmit / receive antennas 101 is amplified in the amplification sections 102. Sections 103 transmit / receive receive uplink signals amplified in sections 102 amplification. The received signals are converted into a baseband signal by frequency conversion in transmission / reception sections 103 and output to a baseband signal processing section 104.

In baseband signal processing section 104, user data contained in upstream input signals is subjected to a fast Fourier transform (FFT) process, an inverse discrete Fourier transform (IDFT) process, error correction decoding, a MAC retransmission control receive process, RLC layer receiving processes, and level PDCP, and transmitted to the apparatus 30 of the station of a higher level through the interface 106 of the communication path. The call processing section 105 performs call processing to tune and release communication channels, manages the state of the radio base stations 10, and manages radio resources.

The communication path interface section 106 transmits and receives signals to / from the higher-level station apparatus 30 via the interface. Also, the communication path interface 106 transmits and receives signals (reverse signaling) to / from other radio base stations 10 via an interface between base stations (which, for example, is a fiber optic interface compatible with a public radio interface (CPRI) Radio Interface), X2 interface, etc.).

It should be noted that the transmit / receive sections 103 may also have an analog beamforming section that forms analog beams. An analog beamforming section may be based on an analog beamforming circuit (e.g., phase shifter, phase shifter, etc.) or an analog beamforming device (e.g., phase shifter) that can be characterized based on a general understanding the technical field to which the present invention belongs. In addition, transmit / receive antennas 101 may be based on, for example, antenna arrays. In addition, the transmit / receive sections 103 are designed to be able to use single BF or multiple BF operations.

Sections 103 transmit / receive downlink signals (for example, at least one of the following: NR-PDCCH / PDSCH, mobility measurement signals, CSI-RS signals, DMRS, DCI signals and downlink data) and receives uplink signals (for example, at least at least one of the following: PUCCH, PUSCH, beam recovery signals, measurement reports, beam reports, CSI reports, L1-RSRP reports, UCI and upstream data).

In addition, the transmit / receive sections 103 transmit configuration information for L3 measurements and / or L1 measurements (e.g., at least one of information showing configurations of mobility measurement signals (e.g., CSI-RS signals and / or SS blocks), information showing the CSI-RS resource configurations and information showing the communication between the DMRS ports and the CSI-RS signals). Also, transmit / receive sections 103 may transmit information indicating a relationship (QCL) between CSI-RS resources for beam control and / or measurements of CSI and CSI-RS resources for mobility management, and / or information indicating a relationship (QCL) between these CSI-RS resources for beam control and / or CSI measurement and SS units for mobility management.

Also, the transmit / receive sections 103 may receive the PRACH preamble and transmit the RAR. Also, the transmit / receive sections 103 may receive the SR. Also, the transmit / receive sections 103 can receive uplink signals transmitted from the radio base station 10 without DCI (uplink grants).

FIG. 10 is a diagram showing an exemplary functional structure of a radio base station according to an embodiment of the present invention. It should be noted that although this example mainly shows functional blocks related to the characterizing parts of the present invention, the radio base station 10 also contains other functional blocks necessary for radio communication.

The baseband signal processing section 104 comprises a control section (scheduler) 301, a transmission signal generating section 302, a display section 303, a received signal processing section 304, and a measurement section 305. It should be noted that these configurations are only necessary for inclusion in the radio base station 10, and some or all of these configurations may not be included in the baseband signal processing section 104.

The control section 301 (scheduler) controls the entire radio base station 10. The control section 301 may be based on a controller, control circuit, or control apparatus, which may be characterized based on a general understanding of the technical field to which the present invention pertains.

The control section 301 controls, for example, generating signals in the transmission signal generating section 302, distributing signals by the display section 303, and so on. In addition, the control section 301 controls the process of receiving signals in the received signal processing section 304, measuring signals in the measuring section 305, and so on.

Control section 301 controls scheduling of downlink data channels and uplink data channels and controls the generation and transmission of DCI that schedules downlink data channels (downlink assignments) and DCI that schedules uplink data channels (uplink grants).

The control section 301 may control such that Tx beams and / or Rx beams are generated using digital BF (e.g., precoding) by the baseband signal processing section 104 and / or analog BF (e.g., phase rotation) using the sections 103 transmission / reception.

The control section 301 controls beams (Tx beams and / or Rx beams) used for transmitting and / or receiving downlink signals (eg, NR-PDCCH / PDSCH). More specifically, control section 301 can control these beams based on CSI (at least one of CRI, CQI, PMI, and RI) from user terminals 20.

Control section 301 can control beams used to transmit and / or receive a plurality of measurement signals (including mobility measurement signals and beam measurement signals such as CSI-RS signals and SS blocks, for example).

In addition, control section 301 can control beam recovery (switching) based on beam recovery signals from user terminals 20. More specifically, control section 301 can identify the best beams of user terminals 20 based on beam recovery signals and control beam re-tuning (CSI-RS re-tuning). resources, reconfiguring QCL between DMRS ports and CSI-RS resources, etc.).

In addition, the control section 301 may control so that information about the reconfigured beams (e.g., information representing the configurations of the reconfigured CSI-RS resources and / or information representing the QCL between the DMRS ports and the CSI-RS resources) is included in the signals , in response to recovery signals, and transmitted.

In addition, control section 301 may control generation and / or transmission of scheduling information (DCI) of the response signals. This DCI may be transmitted using an NR-PDCCH (also called "common search space (CSS)") for use for at least one of the following: RAR, paging, and system information blocks (SIBs). In this case, this DCI can be scrambled (masked) using indicators specific to the user terminal (eg, C-RNTIs).

The transmission signal generating section 302 generates downlink signals based on commands from the control section 301, and outputs these signals to the display section 303. The transmission signal generating section 302 may be based on a signal generator, a signal conditioning circuit, or a signal conditioning apparatus, which may be characterized based on a general understanding of the technical field to which the present invention pertains.

The transmit signal generating section 302 generates DCIs (downlink assignments, uplink grants, etc.) based on commands from the control section 301, for example. In addition, the downlink data channel (PDSCH) is subjected to an encoding process, a modulation process, a beamforming process (precoding process) based on coding categories, modulation schemes, etc., determined based on CSI from each user terminal 20, for example.

The mapping section 303 maps the downlink signals generated in the transmission signal generating section 302 to radio resources based on commands from the control section 301, and outputs them to the transmission / reception section 103. The display section 303 may be based on a display, display circuit, or display apparatus which can be characterized based on a general understanding of the technical field to which the present invention pertains.

The received signal processing section 304 performs reception processes (eg, demapping, demodulation, decoding, etc.) on the received signals that are input from the transmit / receive sections 103. Here, the received signals are, for example, uplink signals transmitted from the user terminals 20. For the received signal processing section 304, a signal processor, signal processing circuitry, or signal processing apparatus may be used, which may be characterized based on a general understanding of the art. the present invention.

The received signal processing section 304 outputs the decoded information obtained through the acquisition processes to the control section 301. For example, when feedback information (eg, CSI, HARQ-ACK, etc.) is received from the user terminal, this feedback information is output to the control section 301. In addition, the received signal processing section 304 outputs received signals, a signal after receiving processes, and so on. to section 305 measurements.

Measurement section 305 measures the received signals. Measurement section 305 may be based on a meter, metering circuit, or metering apparatus, which may be characterized based on a general understanding of the technical field to which the present invention pertains.

Measurement section 305 may measure, for example, received power (e.g., RSRP and / or RSSI), received quality (e.g., at least one of the following: RSRQ, signal-to-interference-plus-noise ratio (SINR), and signal-to-noise ratio (SNR )), channel state, etc. for received signals. The measurement results can be output to the control section 301.

(User terminal)

FIG. 11 is a diagram showing an exemplary general structure of a user terminal according to the present invention. The user terminal 20 includes a plurality of transmit / receive antennas 201, amplification sections 202 and transmit / receive sections 203, a baseband signal processing section 204, and an application section 205. It should be noted that one or more transmit / receive antennas 201, sections 202 amplification and sections 203 transmission / reception.

RF signals received at transmit / receive antennas 201 are amplified in amplification sections 202. Sections 203 transmit / receive receive downlink signals amplified in sections 202 amplification. The received signals are subjected to frequency conversion and converted to a baseband signal in the transmit / receive sections 203 and output to the baseband signal processing section 204. The transmit / receive sections 203 may be based on a transmitter / receiver, a transmit / receive scheme, or a transmit / receive apparatus, which can be characterized based on a general understanding of the technical field to which the present invention pertains. It should be noted that the transmission / reception section 203 may be constructed as a single transmission / reception section, or may be constructed of a transmission section and a reception section.

In the baseband signal processing section 204, the input baseband signal is subjected to an FFT process, error correction decoding, retransmission control receiving process, and so on. Downlink user data is passed to application section 205. Application section 205 performs processes related to higher layers, above the physical layer and MAC layer, and so on. In addition, in the downlink data, broadcast information is also transmitted to the application section 205.

At the same time, upstream user data is input from the application section 205 to the baseband signal processing section 204. The baseband signal processing section 204 performs retransmission control transmission processing (e.g., HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, and BOTF processing, etc., and the result is transmitted to transmission section 203. reception. The baseband signals output from the baseband signal processing section 204 are converted to the radio frequency range in the transmit / receive sections 203 and transmitted. RF signals subjected to frequency conversion in the transmit / receive sections 203 are amplified in the amplifying sections 202 and transmitted from the transmit / receive antennas 201.

It should be noted that transmit / receive sections 203 may also have an analog beamforming section that forms analog beams. An analog beamforming section may be based on an analog beamforming circuit (e.g., phase shifter, phase shifter, etc.) or an analog beamforming device (e.g., phase shifter) that can be characterized based on a general understanding the technical field to which the present invention belongs. In addition, transmit / receive antennas 201 may be based on, for example, antenna arrays. In addition, the transmit / receive sections 203 are designed to be capable of single BF and multiple BF operations.

The transmit / receive sections 203 receive downlink signals (e.g., at least one of the following: NR-PDCCH / PDSCH, mobility measurement signals, beam measurement signals, CSI-RS signals, DMRS, DCI signals, downlink data, and SS blocks) and transmit upstream signals (eg, at least one of the following: PUCCH, PUSCH, recovery signals, measurement reports, beam reports, CSI reports, UCI reports, and upstream data).

Also, transmit / receive sections 203 receive configuration information for L3 measurements and / or L1 measurements (e.g., at least one of information showing configurations of mobility measurement signals (e.g., CSI-RS signals and / or SS blocks), information, showing the configuration of CSI-RS resources and information showing the relationship between the DMRS ports and the CSI-RS signals). Also, transmit / receive sections 203 may receive information indicating a relationship (QCL) between CSI-RS resources for beam control and / or measurements of CSI and CSI-RS resources for mobility management, and / or information indicating a relationship (QCL) between these CSI-RS resources for beam control and / or CSI measurements and SS units for mobility management.

In addition, transmit / receive sections 203 can transmit a PRACH preamble and receive an RAR. Also, the transmit / receive sections 203 may transmit SR. In addition, the transmit / receive sections 203 can transmit upstream signals from the radio base station 10 without DCI (upstream grants).

FIG. 12 is a diagram showing an exemplary functional structure of a user terminal according to an embodiment of the present invention. It should be noted that although this example mainly shows functional blocks related to the characterizing parts of the present invention, the user terminal 20 also contains other functional blocks necessary for radio communication.

The baseband signal processing section 204 provided in the user terminal 20 includes at least a control section 401, a transmission signal generating section 402, a display section 403, a received signal processing section 404, and a measurement section 405. It should be noted that these configurations are only necessary for inclusion in the user terminal 20, and some or all of these configurations may not be included in the baseband signal processing section 204.

The control section 401 controls the entire user terminal 20. The control section 401 may use a controller, control circuit, or control apparatus, which may be characterized based on a general understanding of the technical field of the present invention.

The control section 401 controls, for example, generating signals in the transmission signal generating section 402, distributing signals by the display section 403, and so on. In addition, the control section 401 controls the processes of receiving signals in the received signal processing section 404, measuring signals in the measuring section 405, and so on.

The control section 401 receives from the received signal processing section 404 downlink control signals (downlink control channels) and downlink data signals (downlink data channels) transmitted from the radio base station 10. The control section 401 controls the generation of upstream control signals (e.g., delivery confirmation information, etc.) etc.) and / or uplink data signals based on whether retransmission control is necessary, which is decided in accordance with downlink control signals, downlink data signals, etc.

The control section 401 may control such that the transmission beams and / or reception beams are generated using digital BF (e.g., precoding) by the baseband signal processing section 204 and / or analog BF (e.g., phase rotation) using the sections 203 transmission / reception.

Control section 401 controls beams (Tx beams and / or Rx beams) used for transmitting and / or receiving downlink signals (eg, NR-PDCCH / PDSCH).

Also, control section 401 controls the transmission of signals (beam recovery signals) to request switching of beams (active beams) used for transmitting and / or receiving downlink signals based on the received power measured based on one or more measurement signals (e.g., RSRP) ...

For example, control section 401 controls transmission of beam recovery signals based on L1-CSI-RSRP (first received power) measured based on CSI-RS resources associated with active beams and a predetermined threshold (step S101 of FIG. 5 and step S201 in Fig. 6).

In addition, control section 401 controls transmission of the above request signals based on L1-CSI-RSRP measured based on CSI-RS resources associated with active beams and L3-CSI-RSRP (second received power) measured based on CSI-RS resources associated with inactive beams (step S102 of FIG. 5).

In addition, the control section 401 controls transmission of the above request signals based on the L1 / L3-SS-RSRP (third received power) measured based on the SS blocks associated with the active beams and L1 / L3-SS-RSRP (fourth received power) measured based on blocks SS associated with inactive beams (step S202 of FIG. 6).

The beam recovery signal can be one of the following: a PRACH preamble, SR, and an upstream signal without upstream grant. An upstream signal without an upstream grant can be transmitted on an upstream resource.

In addition, control section 401 may control the transmission of measurement reports based on the L3 measurements using mobility measurement signals (eg, CSI-RS signals and / or SS blocks). Each of these measurement reports may contain at least one of the following: a beam ID (or information indicating a beam ID), RSRP, and RSRQ of a beam, where RSRP / RSRQ satisfies a specified condition.

In addition, control section 401 may control transmission of CSI and / or L1-RSRP reports based on L1 measurements using beam measurement signals (eg, CSI-RS signals and / or SS blocks). These CSI reports and / or L1-RSRP reports can be transmitted to the radio base station 10 using uplink physical channels (eg, PUSCH and / or PUCCH).

In addition, the control section 401 may control the reception process (demodulation and decoding) of the downlink signals based on the information showing the QCL between the DMRS and CSI-RS ports by resources provided by the radio base station 10. More specifically, the control section 401 may assume that the same The same beams as the CSI-RS resources associated with the DMRS ports are used for transmitting and / or receiving downstream signals.

In addition, control section 401 may control the reception (demodulation and / or decoding) of the response signals to the beam reconstruction signals. For example, control section 401 may assume that a beam used to transmit and / or receive a response signal (and / or a search domain NR-PDCCH to schedule this response signal) is used to transmit and / or receive the best RSRP mobility measurement reference signal. / RSRQ.

The transmission signal generating section 402 generates upstream signals (upstream control signals, upstream data signals, upstream reference signals, etc.) based on commands from the control section 401, and outputs these signals to the display section 403. The transmission signal generating section 402 may be based on a signal generator, a signal conditioning circuit, or a signal conditioning apparatus, which may be characterized based on a general understanding of the art to which the present invention relates.

The transmission signal generating section 402 generates feedback information (eg, at least one of the following: HARQ-ACK, CSI, and scheduling request) based on, for example, a command from the control section 401. Also, the transmission signal generating section 402 generates uplink data signals based on commands from the control section 401. When, for example, an uplink grant is included in a downlink control signal communicated from the radio base station 10, the control section 401 issues a command to the transmission signal generating section 402 to generate an uplink data signal.

The display section 403 maps upstream signals generated in the transmission signal generating section 402 to radio resources based on commands from the control section 401 and outputs the results to the transmission / reception section 203. The display section 403 may be based on a display, display circuit, or display apparatus that can be characterized based on a general understanding of the technical field to which the present invention pertains.

The received signal processing section 404 performs reception processes (eg, de-mapping, demodulation, decoding, etc.) on the received signals that are input from the transmit / receive sections 203. Herein, the received signals include, for example, downlink signals (downlink control signals, downlink data signals, downlink reference signals, etc.) transmitted from the radio base station 10. The received signal processing section 404 may be based on a signal processor, signal processing circuits or signal processing apparatus that can be characterized based on a general understanding of the technical field to which the present invention relates. Also, the received signal processing section 404 may constitute a receiving section in accordance with the present invention.

The received signal processing section 404 outputs the decoded information obtained by the receiving processes to the control section 401. The received signal processing section 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, etc. to control section 401. In addition, the received signal processing section 404 outputs received signals, signals after receiving processes, etc. to section 405 measurements.

Measurement section 405 makes measurements with respect to the received signals. For example, measurement section 405 performs measurements using mobility measurement signals and / or CSI-RS resources transmitted from radio base station 10. Measurement section 405 may be constructed from a meter, measurement circuit, or measurement apparatus, which may be characterized based on a common understanding. the technical field to which the present invention relates.

Measurement section 405 can measure, for example, received power (eg, RSRP and / or RSSI), received quality (eg, at least one of the following: RSRQ, SINR, and SNR), channel conditions, etc. for received signals. The measurement results can be output to the control section 401.

(Hardware structure)

It should be noted that the block diagrams used to describe the above embodiments illustrate blocks in functional units. These functional blocks (components) can be implemented in arbitrary combinations of hardware and / or software. Also, the means for implementing each functional block are not limited to particular cases. That is, each functional block can be implemented by one physically and / or logically combined part of the apparatus, or can be implemented by directly and / or indirectly connected two or more physically and / or logically separate parts of the apparatus (using, for example, a wired connection or wireless connections) and using these multiple parts of the apparatus.

For example, a radio base station, user terminals, and the like, in accordance with embodiments of the present invention, may function as a computer that performs processes of a radio communication method in accordance with the present invention. FIG. 13 is a diagram showing an exemplary hardware structure of a radio base station and a user terminal according to one embodiment of the present invention. The above-described radio base stations 10 and user terminals 20 may be physically configured as a computing device that includes a processor 1001, a memory 1002, a memory 1003, a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006, and a bus 1007.

It should be noted that in the following description, the word “apparatus” may be replaced by “circuit”, “device”, “block”, etc. It should be noted that the hardware structure of the radio base station 10 and user terminal 20 may be designed to include one or more of the apparatuses shown in the figures, or it may be designed not to include a subset of the apparatuses.

For example, although only one processor 1001 is shown, multiple processors may be provided. In addition, processes can be executed with a single processor, or processes can be executed sequentially or otherwise on two or more processors. It should be noted that the processor 1001 may be implemented with one or more chips.

Each function of the radio base station 10 and user terminal 20 is implemented by reading software (program) on hardware, such as processor 1001 and memory 1002, and by controlling computations in processor 1001, communication in communication apparatus 1004, and reading and / or writing data to memory 1002 and memory 1003.

The processor 1001 can control the entire computer using, for example, the execution of the operating system. The processor 1001 can be configured with a central processing unit (CPU) that includes interfaces to a peripheral apparatus, a control apparatus, a computing apparatus, a register, etc. For example, the aforementioned baseband signal processing section 104 (204), call processing section 105, etc. can be implemented by processor 1001.

In addition, the processor 1001 reads programs (program codes), program modules, data, etc. from memory 1003 and / or communication apparatus 1004 to memory 1002 and performs various processes in accordance therewith. With regard to programs, programs can be used to enable computers to perform at least a portion of the operations of the above-described embodiments. For example, the control section 401 of the user terminals 20 can be implemented with control programs stored in the memory 1002 and operating on the processor 1001, and other functional blocks can be implemented in a similar manner.

The memory 1002 is a computer-readable recording medium and may be based on, for example, at least one of the following: ROM (read only memory), EPROM (erasable programmable ROM), EEPROM (electrically erasable programmable ROM), RAM (random access memory) ) and / or other suitable storage medium. The memory 1002 may be referred to as "register", "cache", "main memory" (primary storage), etc. Memory 1002 can store executable programs (program codes), program modules, etc. for performing radio communication methods according to embodiments of the present invention.

The storage device 1003 is a computer-readable recording medium and may be based on, for example, at least one of the following: a floppy disk, a floppy disk (from the English floppy, a registered trademark), a magnetic-optical disk (for example, a ROM on a compact disc (CD-ROM), etc.), digital versatile disc, Blu-ray (registered trademark) disc, removable disc, hard disk, smart card, flash memory device (such as card, memory card, memory type "key drive"), magnetic stripe, database, server and / or other suitable storage medium. The storage device 1003 may be referred to as "auxiliary storage".

Communication apparatus 1004 is hardware (transmit / receive device) for enabling communication between computers using wired and / or wireless networks and may also be called, for example, "network device", "network controller", "network card", " communication module "and the like. Communication apparatus 1004 may be configured to include a high frequency switch, duplexer, filter, frequency synthesizer, and so on. for realizing, for example, frequency division duplex (FDD) and / or time division duplex (TDD). For example, the above-described transmit / receive antennas 101 (201), amplification sections 102 (202), transmit / receive sections 103 (203), communication path interface 106, etc. may be implemented by communication apparatus 1004.

Input apparatus 1005 is an input device for receiving input from the outside (eg, keyboard, mouse, microphone, switch, button, sensor, etc.). Output apparatus 1006 is an output device for allowing output to be sent outwardly (eg, display, speaker, light-emitting diode (LED) indicator, etc.). It should be noted that the input apparatus 1005 and the output apparatus 1006 may be provided in a combined structure (eg, a touch panel).

In addition, these parts of the apparatus, including the processor 1001, the memory 1002, etc., are connected via a bus 1007 to exchange information. Bus 1007 can be designed as a single bus or can be designed as different buses for different parts of the apparatus.

Also, the radio base station 10 and user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC). Integrated Circuit), programmable logic device (PLD, from English Programmable Logic Device), programmable gate array (FPGA, from English.Field Programmable Gate Array), etc., and the hardware can implement some or all of the functional For example, processor 1001 may be implemented with at least one of these pieces of hardware.

(Options)

It should be noted that the terminology used in the description, and the terminology necessary to understand this description, may be replaced by other terms having the same or similar meaning. For example, “channels” and / or “symbols” can be replaced with “signals” (or “signaling”). Also "signals" can be "messages". The reference signal can be abbreviated to "OC" and can be called "pilot" or "pilot", etc., depending on which standards are applied. In addition, the “component carrier” (CC) may be referred to as “cell”, “frequency carrier”, “carrier frequency”, and so on.

In addition, a radio frame can be composed of one or more periods (frames) in the time domain. Each of one or more periods (frames) forming a radio frame may be referred to as a “subframe”. In addition, a radio frame may be composed of one or more slots in the time domain. A subframe can be a fixed length of time (eg, 1 ms) independent of numerology.

In addition, a slot may be composed of one or more time domain symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). Also, the slot can represent a unit of time based on numerology. Also, a slot can include multiple minislots. Each minislot can consist of one or more symbols in the time domain. Also, a mini-slot can be referred to as a "subslot".

A radio frame, subframe, slot, minislot, and symbol represent a unit of time in signal transmission. Each of the radio frame, subframe, slot, minislot, and symbol may be referred to by other suitable names. For example, one subframe may be referred to as a "Transmission Time Interval" (TTI), multiple consecutive subframes may be referred to as "TTI", or one slot or one mini-slot may be referred to as a "TTI". That is, the subframe and / or TTI may be a subframe (1ms) in existing LTE, may be a shorter period than 1ms (e.g., one to thirteen symbols), or may be a longer period of time than 1ms. ... It should be noted that the unit representing the TTI may be called “slot”, “minislot”, etc., instead of “subframe”.

In this case, TTI is understood, for example, as the minimum scheduling time unit in radio communication. For example, in LTE systems, the radio base station schedules radio resources (such as bandwidth and transmit power that can be used in each user terminal) to be allocated to each user terminal in TTI units. It should be noted that the definition of TTIs is not limited to this.

The TTI may represent a unit of time for transmission of channel-encoded data packets (transport blocks), code blocks and / or codewords, or may represent a unit of processing in scheduling, link adaptation, etc. It should be noted that when a TTI is set, the time interval (eg, number of symbols) in which transport blocks, code blocks, and / or codewords are actually mapped may be shorter than the TTI.

It should be noted that when one slot or one mini-slot is referred to as a "TTI", one or more TTIs (ie, one or more slots or one or more mini-slots) may represent the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) that constitutes this minimum scheduling time unit can be adjusted.

A TTI having a time duration of 1 ms may be referred to as "normal TTI" (TTI in LTE versions 8-12), "long TTIs", "normal subframe", "long subframe", and so on. A TTI shorter than a normal TTI may be referred to as a "short TTI", "short TTI", "partial TTI" (or "fractional TTI"), "short subframe", "short subframe", "minislot", "sub-slot", and so on.

It should be noted that a long TTI (e.g., a normal TTI, subframe, etc.) may be replaced with a TTI having a time duration greater than 1 ms, and a short TTI (e.g., a shortened TTI) may be replaced with a TTI having a length The TTI is less than the TTI length of the long TTI and is not less than 1 ms.

Resource Block (RB) is a unit of resource allocation in the time domain and frequency domain and may include one or multiple consecutive subcarriers in the frequency domain. Also, the RB may include one or more symbols in the time domain and may be one slot, one minislot, one subframe, or one TTI in length. Each of one TTI and one subframe may be composed of one or more resource blocks. It should be noted that one or more RBs may be referred to as a "Physical Resource Block" (PRB), "Sub-Carrier Group" (SCG), "Resource Element Group" (REG, from the English Resource Element Group), “PRB pair”, “RB pair”, etc.

In addition, a resource block can be composed of one or more resource elements (REs). For example, one RE may represent a radio resource region of one subcarrier and one symbol.

It should be noted that the structures of the radio frames, subframes, slots, minislots, symbols, etc. disclosed above are only examples. For example, configurations relating to the number of subframes included in a radio frame, the number of slots included in a subframe of a radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in TTI, character duration, length of cynlic prefixes (CP, from the English Cyclic Prefix), etc. can be changed in various ways.

Also, the information and parameters disclosed in this description may be presented in absolute terms or in relative terms relative to predetermined values, or may be presented in other formats of information presentation. For example, radio resources can be identified using predefined indices. In addition, equations using these parameters, etc., other than those explicitly disclosed herein, may be used.

Names used for parameters, etc. in the present description are in no way limiting. For example, since the various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information items can be identified using any suitable names, the different names assigned to these individual channels and information items are not way are not limiting.

Information, signals, and / or otherwise disclosed herein may be represented using a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, microcircuits, and the like that may be referred to in the foregoing description may be represented as voltages, electric currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination of them.

Also, information, signals, etc. can be driven from higher levels to lower levels and / or from lower levels to higher levels. Information, signals, and the like can be input and / or output through a variety of network nodes.

Information, signals, etc., which are input data and / or output data, can be stored in a specific location (eg, memory) or can be manipulated using a control table. Input and / or output information, signals, etc. can be overwritten, updated, or attached. Information, signals, etc., which are output data, can be deleted. Information, signals, etc., which are input data, can be transferred to other parts of the machine.

The communication of information is in no way limited to the examples / embodiments disclosed herein, and other methods may also be used. For example, the information message can be implemented using physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling (adio Resource Control) , broadcast information (basic information block (MIB), system information blocks (SIBs), etc.), MAC signaling (medium access control), etc.) and other signals and / or combinations thereof.

Note that the physical layer signaling may be called “Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals)”, “L1 control information (L1 control signal)”, and so on. Also, the RRC signaling may be referred to as "RRC messages" and may be, for example, an RRC connection setup message, an RRC connection re-configuration message, or the like. Also, MAC signaling can be communicated using, for example, MAC Control Elements (MAC CE).

Also, a predetermined information message (eg, an information message for the "hold X" effect) does not have to be sent explicitly, but can be sent implicitly (by, for example, not performing this piece of information).

Decisions can be made in values expressed as one bit (0 or 1), they can be made in Boolean values expressing true or false, or they can be made by comparing numerical values (for example, comparing with a predetermined value).

Software referred to as "software", "firmware", "middleware", "microcode" or "hardware description language", or referred to in other terms, should be interpreted broadly to mean instructions, sets of instructions, code, segments of code, program codes, programs, subroutines, software modules, applications, application programs, software packages, algorithms, subalgorithms, objects, executable files, execution threads, procedures, functions, etc.

Also, software, commands, information, etc. can be transmitted and received by means of communication. For example, when software is transmitted from a website, server, or other remote source using wired technologies (coaxial cables, fiber optic cables, twisted pair cables, digital subscriber lines (DSL), etc. ) and / or wireless technologies (infrared radiation, microwaves, etc.), these wired technologies and / or wireless technologies are also included in the definition of communications.

The terms "system" and "network" as used in this application are used interchangeably.

In the context of this application, the terms “base station (BS)”, “radio base station”, “eNB”, “gNB”, “cell”, “sector”, “cell group”, “carrier” and “component carrier” can be used interchangeably. ... The base station may be called a “fixed station”, “NodeB”, “eNodeB (eNB)”, “access point”, “transmission point”, “receive point”, “femtocell, small cell”, and so on.

The base station can accommodate one or more (eg, three) cells (also called "sectors"). When a base station accommodates many cells, the entire coverage area of the base station can be divided into many small areas, and each small area can provide communication services through the subsystems of the base station (for example, small base stations for indoor use (RRH, from Remote Radio Head , remote radio units)). The term "cell" or "sector" refers to a portion of the entire coverage area of a base station and / or a base station subsystem providing communication services within that coverage.

In the context of this application, the terms “mobile station (MS)”, “user terminal”, “user equipment (UE)” and “terminal” may be used interchangeably. The base station may be called a “fixed station”, “NodeB”, “eNodeB (eNB)”, “access point”, “transmission point”, “receive point”, “femtocell, small cell”, and so on.

A mobile station may be referred to as a person skilled in the art “subscriber station”, “mobile unit”, “subscriber unit”, “wireless unit”, “remote unit”, “mobile device”, “wireless device”, “wireless communication device”, “ remote device "," mobile subscriber station "," access terminal "," mobile terminal "," wireless terminal "," remote terminal "," portable device "," user agent "," mobile client "," client "or some other suitable terms.

In addition, user terminals can be understood as radio base stations in the present description. For example, each aspect / embodiment of the present invention can be applied to a configuration in which communication between a radio base station and a user terminal is replaced by communication between multiple user terminals (D2D (from English. Device-to-Device)). In this case, the user terminals 20 may have the functions of the above-disclosed radio base stations 10. In addition, terms such as “upstream” and “downstream” can be understood as “side”. For example, an uplink can be understood as a side channel.

Likewise, user terminals in the present description can be understood as radio base stations. In this case, the radio base stations 10 may have the functions of the user terminals 20 disclosed above.

Some of the actions that have been disclosed in the present description, performed by base stations, in some cases, can be performed by higher-level nodes (upstream nodes). Obviously, in a network consisting of one or more network nodes with base stations, various operations performed to communicate with terminals can be performed by base stations, one or more network nodes (for example, among possible MMEs (Mobility Management Entities , mobility management nodes), S-GW (Serving-Gateways, serving gateways), etc., without limitation), other than base stations, or combinations thereof.

The examples / embodiments illustrated herein can be used alone or in combinations that can be switched between depending on the implementation method. The order of processes, sequences, flowcharts, etc., used to describe examples / embodiments in the present application may be changed as long as it is not controversial. For example, although various methods have been illustrated herein with different components of the steps in sequential order, the specific sequences illustrated in this application are in no way intended to be limiting.

The aspects / embodiments illustrated herein can be applied to systems using LTE (Long Term Evolution Scheme), LTE-A (LTE Advanced Scheme), LTE-B (Super LTE), SUPER 3G, IMT Advanced, 4G ( 4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (future radio access system), New-RAT (new radio access technology), NR (New radio), NX (new radio access), FX (next generation radio access ), GSM (Registered Trademark) (Global System for Mobile Communications), CDMA 2000, UMB (Ultra Wideband Mobile), IEEE 802.11 (Wi-Fi (Registered Trademark)), IEEE 802.16 (WiMAX (Registered Trademark)), IEEE 802.20, UWB (Ultra Wideband), Bluetooth (Registered Trademark)

The phrase “based on” as used herein does not mean “based on only” unless otherwise indicated. In other words, the phrase “based on” can mean both “based on only” and “based on at least”.

The reference to elements with such designations as "first", "second", etc., used in this application, does not generally limit the number / number or order of these elements. These designations are used for convenience only, as a way to distinguish two or more elements. Thus, the reference to the first and second elements does not imply that only two elements can be used, or that the first element must in some way precede the second element.

The terms "assess" and "determine" as used in this application can encompass a wide variety of activities. For example, "evaluate" and "determine" in the context of this application can be understood in the sense of making judgments and definitions with respect to calculation, calculation, processing, inference, research, search (for example, lookup in a table, database or some other data structure), clarification, etc. In addition, "evaluate" and "determine" in the context of this application can be understood in the sense of making judgments and determinations regarding the reception (for example, receiving information), transmission (for example, transmitting information), input, output, access management (for example, access to data in memory), etc. In addition, "evaluate" and "determine" in the context of this application can be understood in the sense of making judgments and determinations with respect to decision making, selection, selection, establishment, comparison, etc. In addition, "evaluate" and "determine" in the context of this application can be understood in the sense of making judgments and determinations about an action.

In the context of this application, the terms “connected” and “connected” or any variation of these terms mean both a direct or indirect connection and a bond between two or more elements, and may include the presence of one or more intermediate elements between two elements, which are “ connected "or" connected "to each other. The connection or connection between elements can be physical, logical, or combinations thereof. For example, “connection” can mean “access”. In the context of this application, two elements can be considered "connected" or "associated" with each other using one or more electrical wires, cables and / or printed electrical connections, and, in some non-limiting and non-limiting examples, using electromagnetic energy, such as electromagnetic energy with wavelengths in the radio frequency range, microwave range and optical range (both visible and invisible).

When terms such as "include", "comprise" and variations of these terms are used in the present description or claims, these terms are intended to be non-exhaustive, in the same way as if the term "provide" was used. In addition, the term "or" in the context of the present description or in the claims should not carry the meaning of excluding disjunction.

At the same time, although the present invention has been disclosed in detail above, a person skilled in the art should understand that the present invention is in no way limited to the embodiments disclosed in this application. The present invention can be implemented with various adjustments and in various modifications without deviating from the idea and scope of the present invention, defined by the attached claims. Therefore, the description in this application is provided only for the purpose of illustrating examples and should not limit the present invention in any way.

Claims (10)

1. Terminal containing: a transmission section configured to transmit a beam recovery request signal; and a control section configured to control the transmission of said beam recovery request signal based on the received power and measured using a reference signal resource channel state information (CSI-RS) or a synchronization signal block (SS), which are linked based on quasi-location (QCL) with a demodulation reference signal of the downlink control signal. 2. The terminal of claim 1, wherein the control section is configured to transmit a beam recovery request signal based on the received power measured using a CSI-RS resource or an SS unit associated with the candidate beam. 3. A terminal according to claim 1 or 2, wherein the received power is the received power of the level 1 reference signal (L1-RSRP). 4. The terminal according to any one of paragraphs. 1-3, in which the beam recovery request signal is a physical random access channel (PRACH) preamble. 5. Terminal according to any one of paragraphs. 1-4, in which the control section is configured to decode in the search area of the downlink control channel for a response signal to a beam recovery request signal. 6. A radio communication method, which includes the stages at which: transmitting a beam recovery request signal; and control the transmission of said beam recovery request signal based on the received power measured using a channel status information (CSI-RS) reference signal resource or a synchronization signal (SS) block, which are coupled on a quasi-locating (QCL) basis to a downlink control demodulation reference signal ...

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